Engine will not stay running

LOUD PELLETIER

MEMBER
2003 CHEVROLET SILVERADO
8.1L
V8
4WD
AUTOMATIC
155,000 MILES

I have an 8.1 vortec and when I come to start it it crank and running rough and shut off 2-3 time and after it starts normally 2 seconds. But if I leave the key in the on position and pump the accelerator pedal 10 time he starts at the quarter of a turn but he won’t stay running after 2 seconds he stop. And the pump is functional, the relays are tested, the spark plugs are new, fuel regulator are tested and I have no fuel level and I put 25 liter of gasoline and I have no fuel level in my cluster and no voltage indicator even if my battery is new but my cluster are rebuild by a pro.

Sunday, August 15th, 2021 AT 8:02 PM

1 Reply

JACOBANDNICKOLAS

MECHANIC
110,047 POSTS

Hi,

Have you tested the ignition relay? When the key is in the start or run position, the ignition relay sends power to the following fuses:

- PCM 1
- ETC/ECM
- INJ 1
- INJ 2

If the relay is going bad, you will lose power to the aforementioned components and the vehicle will shut down.

I attached the steps for testing the ignition relay system. Take a look through them and let me know if you find anything helpful.

Also, have you scanned the computer for diagnostic trouble codes? If not, you should.

Here is a video showing how it's done:

https://youtu.be/b2IJGfImVvw

IF you already have done that, let me know if any codes were found.

Let me know.

Joe

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